题目: Enhanced Interfacial Kinetics of Carbon Monolith Boosting Ultrafast Na‐Storage

  

作者: Lei Liu1, Yu Chen1,3*, Yihao Xie1, Peng Tao1, Zijing Wang2, Qingyi Li2, Kexin Wang2, Chenglin Yan2*


单位:

1. School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China

2. College of Energy, Soochow Institute for Energy and Materials InnovationS, Soochow University, Suzhou 215006, China

3. National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Jiangsu 215123, P.R. China

  

摘要:Slow ion kinetics of negative electrode materials is the main factor of limiting fast charge and discharge of batteries. Sluggish Na+ kinetics property leads to large electrode polarization, resulting in poor rate and cyclic performances. Herein, an electrode of ultrasmall tin nanoparticles decorated in N, S codoped carbon monolith (TCM) with exceptional high‐rate capability and ultrastable cycling behavior for Na‐storage is reported. The resulted TCM electrode exhibits an extremely high retention of 96% initial charge capacity after 500 cycles at a current density of 500 mA g1. Significantly, when the current density is elevated to an ultrahigh rate of 5000 mA g1, a high reversible capacity of 228 mAh g1 after the 2000th cycle is still maintained. More importantly, the stable and fast Na‐storage of TCM is investigated and understood by experimental characterizations and kinetics calculations, including interfacial ion/electron transport behavior, ion diffusion, and quantitative pseudocapacitive analysis. These investigations elucidate that the TCM shows improved ion/electron conductivity and enhanced interfacial kinetics. An entirely new perspective to deep insights into the fast ion/electron transport mechanisms revealed by interfacial kinetics of sodiation/desodiation, which contributes to the profound understanding for developing fast charging/discharging and long‐term stable electrodes in sodium‐ion batteries, is provided.

  

影响因子: 9.59

  

分区情况:一区

  

链接:https://onlinelibrary.wiley.com/doi/full/10.1002/smll.201804158